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#!/usr/bin/python

#

# Copyright (C) 2013 Google Inc.

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301, USA.

"""Script for testing ganeti.utils.lvm"""

import unittest

from ganeti import constants

from ganeti import utils

from ganeti.objects import LvmPvInfo

import testutils

class TestLvmExclusiveCheckNodePvs(unittest.TestCase):

  """Test cases for LvmExclusiveCheckNodePvs()"""

  _VG = "vg"

  _SMALL_PV = LvmPvInfo(name="small", vg_name=_VG, size=100e3, free=40e3,

                        attributes="a-")

  _MED_PV = LvmPvInfo(name="medium", vg_name=_VG, size=400e3, free=40e3,

                      attributes="a-")

  _BIG_PV = LvmPvInfo(name="big", vg_name=_VG, size=1e6, free=400e3,

                      attributes="a-")

  # Allowance for rounding

  _EPS = 1e-4

  def testOnePv(self):

    (errmsgs, (small, big)) = utils.LvmExclusiveCheckNodePvs([self._MED_PV])

    self.assertFalse(errmsgs)

    self.assertEqual(small, self._MED_PV.size)

    self.assertEqual(big, self._MED_PV.size)

  def testEqualPvs(self):

    (errmsgs, (small, big)) = utils.LvmExclusiveCheckNodePvs(

      [self._MED_PV] * 2)

    self.assertFalse(errmsgs)

    self.assertEqual(small, self._MED_PV.size)

    self.assertEqual(big, self._MED_PV.size)

    (errmsgs, (small, big)) = utils.LvmExclusiveCheckNodePvs(

      [self._SMALL_PV] * 3)

    self.assertFalse(errmsgs)

    self.assertEqual(small, self._SMALL_PV.size)

    self.assertEqual(big, self._SMALL_PV.size)

  def testTooDifferentPvs(self):

    (errmsgs, (small, big)) = utils.LvmExclusiveCheckNodePvs(

      [self._MED_PV, self._BIG_PV])

    self.assertEqual(len(errmsgs), 1)

    self.assertEqual(small, self._MED_PV.size)

    self.assertEqual(big, self._BIG_PV.size)

    (errmsgs, (small, big)) = utils.LvmExclusiveCheckNodePvs(

      [self._MED_PV, self._SMALL_PV])

    self.assertEqual(len(errmsgs), 1)

    self.assertEqual(small, self._SMALL_PV.size)

    self.assertEqual(big, self._MED_PV.size)

  def testBoundarySizeCases(self):

    medpv1 = self._MED_PV.Copy()

    medpv2 = self._MED_PV.Copy()

    (errmsgs, (small, big)) = utils.LvmExclusiveCheckNodePvs(

      [medpv1, medpv2, self._MED_PV])

    self.assertFalse(errmsgs)

    self.assertEqual(small, self._MED_PV.size)

    self.assertEqual(big, self._MED_PV.size)

    # Just within the margins

    medpv1.size = self._MED_PV.size * (1 - constants.PART_MARGIN + self._EPS)

    medpv2.size = self._MED_PV.size * (1 + constants.PART_MARGIN - self._EPS)

    (errmsgs, (small, big)) = utils.LvmExclusiveCheckNodePvs(

      [medpv1, medpv2, self._MED_PV])

    self.assertFalse(errmsgs)

    self.assertEqual(small, medpv1.size)

    self.assertEqual(big, medpv2.size)

    # Just outside the margins

    medpv1.size = self._MED_PV.size * (1 - constants.PART_MARGIN - self._EPS)

    medpv2.size = self._MED_PV.size * (1 + constants.PART_MARGIN)

    (errmsgs, (small, big)) = utils.LvmExclusiveCheckNodePvs(

      [medpv1, medpv2, self._MED_PV])

    self.assertTrue(errmsgs)

    self.assertEqual(small, medpv1.size)

    self.assertEqual(big, medpv2.size)

    medpv1.size = self._MED_PV.size * (1 - constants.PART_MARGIN)

    medpv2.size = self._MED_PV.size * (1 + constants.PART_MARGIN + self._EPS)

    (errmsgs, (small, big)) = utils.LvmExclusiveCheckNodePvs(

      [medpv1, medpv2, self._MED_PV])

    self.assertTrue(errmsgs)

    self.assertEqual(small, medpv1.size)

    self.assertEqual(big, medpv2.size)

if __name__ == "__main__":

  testutils.GanetiTestProgram()